Clean mushrooms with damp paper towels. Remove stems; finely chop 1/3
cup of stems, reserving remaining stems for another use. Set mushroom
caps aside. Coat a small skillet with cooking spray; place over
medium-high heat until hot. Add 1/3 cup reserved chopped mushroom
stems and celery; saute 2 minutes or until tender. Combine celery
mix, apple and next 5 ingredients in a small bowl; stir well. Spoon
1-1/2 ts apple mix into each reserved mushroom cap. Place mushrooms
in a 15x10" jelly roll pan; bake at 350° for 15 minutes.
